9. What challenges and limitations are associated with using the host command in reverse, where an IP address is provided to discover the corresponding hostname?
A single IP address may be associated with more than one hostname and DNS doesn't know how to determine which of those hostnames should correspond to the IP address.
The administrator for that host needs to manually setup an additional reverse lookup and administrators often don't do so.
When we use the host command to find the name for an IP address, it can get a bit complicated. This is because one IP address might have several names, and the system isn't always sure which one to show. To make things clear, administrators should set up a reverse lookup manually. However, sometimes they forget or don't do it consistently, making it a bit less reliable.
